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SUMMARY
Since the question of narrow as contrasted to broad species concepts and narrow versus broad generic concepts is important to present day attempts to classify Hymenomycetes into a natural system, the author discusses both in relation to his own experience in the group. Several points are emphasized:
| 1) | Those who work critically with significant numbers of species have arrived at species concepts of about the same “magnitude,” or, if very broad concepts are maintained the species is divided into subspecies with the latter corresponding to the narrow species of the other workers. | ||||
| 2) | It seems to the author, because of the mosaic pattern of speciation in most groups, that relationships can be more clearly expressed by broad generic concepts than by the narrow ones now being proposed by some investigators. | ||||
| 3) | The above conclusion is based in part on the fact that there are obvious parallelisms in hyphal characters just as there are in those involving gross morphology. The best solution will be reached when all the characters of species are taken into account to group them. | ||||
| 4) | It is shown that many of the hyphal characters emphasized today are not as clear and convincing as some investigators would lead us to think, and their value in arriving at concepts of relationship is limited. | ||||